package com.cll.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.cll.constant.MessageConstant;
import com.cll.constant.StatusConstant;
import com.cll.dto.DishDTO;
import com.cll.dto.DishPageQueryDTO;
import com.cll.entity.Dish;
import com.cll.entity.DishFlavor;
import com.cll.entity.Setmeal;
import com.cll.exception.DeletionNotAllowedException;
import com.cll.mapper.DishFlavorMapper;
import com.cll.mapper.DishMapper;
import com.cll.mapper.SetmealDishMapper;
import com.cll.mapper.SetmealMapper;
import com.cll.result.PageResult;
import com.cll.service.DishService;
import com.cll.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired(required = false)
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 新增菜品
     *
     * @param dishDTO
     */
    @Transactional
    @Override
    public void saveWithFlavor(DishDTO dishDTO) {

        //分支Dish对象
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);

        //新增菜品
        dishMapper.save(dish);

        //新增口味列表  补全每一个口味光联字段关联到ID就用循环思想
        List<DishFlavor> dishFlavors = dishDTO.getFlavors().stream().map(dishFlavor -> {
            dishFlavor.setDishId(dish.getId());
            return dishFlavor;
        }).collect(Collectors.toList());

        dishFlavorMapper.saveBatches(dishFlavors);
    }

    /**
     * 分页查询
     *
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult page(DishPageQueryDTO dishPageQueryDTO) {
        //设置当前页码和每页大小
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        //查询分页数据
        Page<DishVO> page = dishMapper.page(dishPageQueryDTO);

        //分支PageResult返回
        return new PageResult(page.getTotal(),page.getResult());
    }


    @Autowired(required = false)
    private SetmealDishMapper setmealDishMapper;
    /**
     * 菜品批量删除
     *
     * @param ids
     */
    @Transactional//事务
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否能够删除---是否存在起售中的菜品？？
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);//后绪步骤实现
            if (dish.getStatus() == StatusConstant.ENABLE) {
                //当前菜品处于起售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        //判断当前菜品是否能够删除---是否被套餐关联了？？
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds != null && setmealIds.size() > 0) {
            //当前菜品被套餐关联了，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        //删除菜品表中的菜品数据
        for (Long id : ids) {
            dishMapper.deleteById(id);//后绪步骤实现
            //删除菜品关联的口味数据
            dishFlavorMapper.deleteByDishId(id);//后绪步骤实现
        }
    }

    /**
     * 根据id查询菜品和对应的口味数据
     *
     * @param id
     * @return
     */
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);

        //根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);//后绪步骤实现

        //将查询到的数据封装到VO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    /**
     * 根据id修改菜品基本信息和对应的口味信息
     *
     * @param dishDTO
     */
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //修改菜品表基本信息
        dishMapper.update(dish);

        //删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            //向口味表插入n条数据
            dishFlavorMapper.saveBatches(flavors);
        }
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    /**
     * 菜品起售停售
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        //把数据封装在一起
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        //数据访问层调用
        dishMapper.update(dish);

        //套餐中包含着菜品,所以想要在这里为套餐做铺垫,套餐含有菜品没有起售的也需要是停售
        List<Long> dishIds = new ArrayList<>();
        dishIds.add(id);
        // select setmeal_id from setmeal_dish where dish_id in (?,?,?)
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(dishIds);
        if (setmealIds != null && setmealIds.size() > 0) {
            for (Long setmealId : setmealIds) {
                Setmeal setmeal = Setmeal.builder()
                        .id(setmealId)
                        .status(StatusConstant.DISABLE)
                        .build();
                setmealMapper.update(setmeal);
            }
        }
    }
}
